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abstract:
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Electron bunches with the unparalleled combination of
high charge, low emittances, and short time duration, as
first produced at the SLAC Final Focus Test Beam
(FFTB), are foreseen to be produced at the SABER
facility. These types of bunches have enabled wakefield
driven accelerating schemes of multi-GV/m in plasmas.
In the context of the Dielectric Wakefield Accelerators
(DWA) such beams, having rms bunch length as short as
20 um, have been used to drive 100 um and 200 um ID
hollow tubes above 20 GV/m surface fields. These FFTB
tests enabled the measurement of a breakdown threshold
in fused silica (with full data analysis still ongoing) [1].
With the construction and commissioning of the SABER
facility at SLAC, new experiments would be made
possible to test further aspects of DWAs including
materials, tube geometrical variations, direct
measurements of the Cerenkov fields, and proof of
acceleration in tubes >10 cm in length. This collaboration
will investigate breakdown thresholds and accelerating
fields in new materials including CVD diamond. Here we
describe the experimental plans, beam parameters,
simulations, and progress to date as well as future
prospects for machines based of DWA structures.
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